Never send a castrated male llama to do a sexually frustrated female llama's job.
"A guard llama...protects sheep, goats, hens or other livestock from...predators. In the past, a single gelded (castrated) male was recommended. In more recent years it has been discovered that single, unbred females make better and safer guardians, [as they] do not pose the risk of attempting copulation (hence smothering) or chasing the smaller livestock."
https://en.wikipedia.org/wiki/Guard_llama
"A guard llama...protects sheep, goats, hens or other livestock from...predators. In the past, a single gelded (castrated) male was recommended. In more recent years it has been discovered that single, unbred females make better and safer guardians, [as they] do not pose the risk of attempting copulation (hence smothering) or chasing the smaller livestock."
https://en.wikipedia.org/wiki/Guard_llama